ab = {       'Swaroop'   : 'swaroopch@byteofpython.info',
             'Larry'     : 'larry@wall.org',
             'Matsumoto' : 'matz@ruby-lang.org',
             'Spammer'   : 'spammer@hotmail.com'
}   
print "Swaroop's address is %s" %ab['Swaroop'] 
ab['Guido'] = 'guido@python.org'  	
del ab['Spammer']					
print '\nThere are %d contacts in the address-book\n' %len(ab) 
for name,address in ab.items():									
	print 'contacts %s at %s' %(name,address)
if 'Guido' in ab:
	print "\nGuido's address is %s" %ab['Guido']
